JP4904403B2 - Exhaust gas recirculation valve - Google Patents

Description

  The present invention relates to an automobile exhaust gas recirculation valve.

Such valves for exhaust gas are known. EP 1 335 158 describes a throttle valve for a fuel system. This throttle valve has one gas inlet and two gas outlets. Each gas outlet is closed by one butterfly valve, in which case the two butterfly valves are arranged perpendicular to each other. This allows the total gas volume to be guided through one or the other gas outlet. Two gas outlets are generally provided to selectively guide the gas selectively after each gas outlet or without cooling. The switching is performed via a butterfly valve that is rotatably supported on a single shaft. In such a throttle valve, there is a drawback that only two adjustments unrelated to the gas amount can be performed. The total gas volume is cooled behind each gas outlet or the total gas volume is further guided without cooling behind the respective gas outlet of the butterfly valve. According to the throttle valve of the prior art, the gas amount cannot be additionally controlled at each adjustment. When it is necessary to additionally control the gas amount according to the operating state, separate shut-off mechanisms are provided behind the two gas outlets of the throttle valve, respectively. )It can be performed. In this case, it is very inconvenient that the construction cost is expensive.
According to German Offenlegungsschrift 3,420,474, a combination valve with a cylindrical bore and a rotary valve is known, and according to GB 11191651, a partial flow of fuel liquid is known. Combination valves for heating devices are known which are controlled and fed to the radiator.

SUMMARY OF THE INVENTION An object of the present invention is to provide a combination valve that can perform the amount control simultaneously with the adjustment of the position “cooling” or “non-cooling”. In this case, the structure of the combination valves shall space is saved.

  This problem has been solved according to the invention by an exhaust gas recirculation valve having the features as claimed in claim 1.

According to the present invention, complete shut-off is possible with the rotary valve. With the arrangement and operation of such a rotary valve, not only can the exhaust gas be cooled and guided by the cooler, but also be adjusted, as well as additionally adjust the amount of gas to be guided by the combination valve It is also possible to do. In this case, since the arrangement of a plurality of butterfly valves is avoided, only a relatively small structural space is required to arrange the combination valves. The determination of whether to guide further with or without cooling the gas during the operation takes place in an advantageous manner in this combination valve, in combination with the continuous metering of the gas, so that the metering of the gas There is no need to provide an additional blocking mechanism for the.

  According to an advantageous embodiment of the invention, on the one hand, the gas inlet E and the gas outlet A and on the other hand the first branch part Z1 and the second branch part Z2 are arranged perpendicular to each other, respectively. The gas inlet E, the gas outlet A, the first branch portion Z1, and the second branch portion Z2 have a common intersection. As a result, the combination valve can be constructed in a particularly compact manner, and at the same time, a rotary valve with a simple structure that can be manufactured relatively easily can be used.

  According to another advantageous embodiment of the invention, a water-cooled cooler is arranged as the cooler. This makes it possible to cool the gas to be cooled particularly quickly and effectively and thus reduce the structural space required for the combination valve in a particularly advantageous manner.

  It is particularly advantageous if the exhaust gas recirculation valve according to the invention is used in an automobile, since in automobiles generally only a relatively small structural space is provided for exhaust gas recirculation.

FIG. 6 is a partial cross-sectional view of the combination valve in the shut-off position. It is a partial cross-sectional view of the combination valve in a position for discharging a small amount of uncooled exhaust gas. It is a partial cross-sectional view of the combination valve in a position where the exhaust gas that has not been cooled is exhausted in its entirety. It is a partial cross-sectional view of the combination valve in a position for discharging a small amount of cooled exhaust gas. It is a cross-sectional view of the combination valve in a position where the entire amount of cooled exhaust gas is discharged. It is a perspective view of the combination valve provided with the rotary valve in the position shown in FIG.

  Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings (FIGS. 1 to 6).

  FIG. 1 shows a partial cross-sectional view of a combination valve in a blocked state. In this case, the gas is an automobile exhaust gas. The combination valve includes a tubular central portion 1, a gas inlet E disposed on the outer peripheral surface of the tubular central portion 1, and a gas disposed on the outer peripheral surface of the tubular central portion 1 adjacent to the gas inlet E. An outlet A, a first branch portion Z1 disposed facing the gas inlet A on the outer peripheral surface of the tubular central portion 1, and a gas outlet E disposed on the outer peripheral surface of the tubular central portion 1 It consists of a second branch part Z2. The first branch part Z1 and the second branch part Z2 are connected to each other via a cooler 3, in which case a water-cooled cooler is used as the cooler 3 in an advantageous manner. The combination valve further has a rotary valve 2 which is supported in the center of the tubular central part 1 so as to be rotatable about the longitudinal axis of the tubular central part 1. The rotary valve 2 is airtightly guided along the inner wall of the tubular central portion 1 at both outer end surfaces when viewed in the longitudinal direction. The rotary valve 2 can at least partially block the gas inlet E, the gas outlet A, the first branch part Z1, and the second branch part Z2 in order to allow gas to pass therethrough depending on the operating state. On the one hand, the gas inlet E and the gas outlet A, and on the other hand, the first branch part Z1 and the second branch part Z2 are arranged perpendicular to each other. In this case, the gas inlet E, the gas outlet A, the first branch part Each of the longitudinal axes of the branch part Z1 and the second branch part Z2 has one common intersection. In the state shown in FIG. 1, the rotary valve 2 blocks the gas inlet E, so that the exhaust gas is not guided through the combination valve. If it is desired that the exhaust gas is not cooled and guided through the combination valve, the rotary valve 2 is slightly rotated counterclockwise (not shown). In this case, the rotary valve 2 is rotated counterclockwise until a desired amount of exhaust gas is guided through the combination valve.

  FIG. 2 shows a partial cross-sectional view of the combination valve when a relatively small amount of exhaust gas is guided through the combination valve in the direction of the arrow without cooling. In this case, the rotary valve 2 is slightly rotated counterclockwise to open a part of the gas inlet E, whereby a small amount of exhaust gas reaches the gas outlet A through the combination valve. In this case, the cooler 3 is not loaded with exhaust gas.

  FIG. 3 shows a partial cross-sectional view of the combination valve in a position to guide the exhaust gas through the combination valve in the direction of the arrow without cooling. In order to obtain this position from the position shown in FIG. 2, it is necessary to further rotate the rotary valve 2 in the counterclockwise direction.

  FIG. 4 shows a partial cross-sectional view of the combination valve with a portion of the exhaust gas cooled and guided through the combination valve in the direction of the arrow. From the state shown in FIG. 1, it is necessary to rotate the rotary valve 2 slightly in the counterclockwise direction. As a result, a part of the gas inlet E is opened, and at the same time, a part of the second branch part Z2 is opened, so that a small amount of the exhaust gas is discharged from the first branch part Z1, the cooler 3 and the second branch part Z2. It is guided to the gas outlet A through the branch part Z2.

  FIG. 5 shows a partial cross-sectional view of the combination valve in a position where the total amount of exhaust gas is cooled and guided through the combination valve. In order to obtain this position from the position shown in FIG. 4, it is necessary to further rotate the rotary valve 2 in the counterclockwise direction.

  FIG. 6 shows a perspective view of the combined valve including the rotary valve 2 in the state shown in FIG. Combination valves generally require only a small amount of construction space and can combine the possibility of gas cooling and the possibility of simultaneously controlling the amount of gas in a particularly advantageous manner. This combination valve is particularly suitable as an exhaust gas recirculation valve in automobiles.

Claims (3)

In an exhaust gas recirculation valve for further guiding gas with or without cooling, a tubular central part (1) and a gas inlet (E) arranged on the outer peripheral surface of the tubular central part (1) A gas outlet (A) disposed next to the gas inlet (E) on the outer peripheral surface of the tubular central portion (1), and the gas outlet (A) on the outer peripheral surface of the tubular central portion (1). ) And a second branch portion (Z2) disposed opposite to the gas inlet (E) on the outer peripheral surface of the tubular central portion (1). The first branch part (Z1) and the second branch part (Z2) are connected to each other via a cooler (3), and the tubular central part (1) A rotary valve (2) supported at the center of the tubular central portion (1) is provided so as to be rotatable about the longitudinal axis of the tube. Is and, the rotary valve (2) is both outer end surfaces in the longitudinal direction, adapted to be guided hermetically against the inner wall of the central portion of the tubular (1), wherein the rotary valve (2) Both outer end surfaces of the gas inlet (E) and the second branch portion (Z2) can be completely shut off at the same time according to the rotational position. The branch portion (Z2) can be at least partially opened, and the gas outlet (A) and the first branch portion (Z1) can be opened. The rotary valve (2) Depending on the operating conditions, the gas inlet (E) and the second branch (Z2) can be rotated to a position where they are completely shut off simultaneously , or the exhaust gas flow is continuously metered and the inlet (E It said further guide positioned twice at the outlet (a) without cooling from) Possible, or from the inlet (E) to cool the exhaust gas stream, said first branch portion (Z1), the cooler (3) and said outlet via said second branch portion (Z2) ( An exhaust gas recirculation valve, characterized in that the exhaust gas recirculation valve is rotatable to a position for further guiding to A).   On the one hand, the gas inlet (E) and the gas outlet (A) are arranged perpendicular to each other, and on the other hand, the first branch part (Z1) and the second branch part (Z2) are arranged perpendicular to each other. The gas inlet (E), the gas outlet (A), the first branch portion (Z1) and the second branch portion (Z2) have one common intersection. The exhaust gas recirculation valve according to claim 1.   The exhaust gas recirculation valve according to claim 2, wherein a water-cooled cooler is provided as the cooler (3).

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